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مریم موسی پور اکبر فرقانی عاطفه صبوری

چکیده

پتاسیم عنصری ضروری برای تولید محصولات کشاورزی است. برای ارزیابی وضعیت پتاسیم تبادلی و محلول در خاک از روش کمیت- شدت (Q/I) استفاده می­کنند. این تحقیق جهت به­دست آوردن شكل­هاي پتاسیم و منحنی­های Q/I در 16 خاک سطحی (30-0 سانتی­متری)، از خاک­های آهکی لرستان انجام شد. برای این کار از محلول کلرید کلسیم 01/0 مولار و کلرید پتاسیم با غلظت­های 33/0، 66/0، 1، 33/1، 2 و 5/2 میلی­مولار استفاده گردید. از هر نمونه، 6 سوسپانسیون تهیه و با استات آمونیوم 1 مولار خنثی عصاره­گیری ­گردید و میزان پتاسیم بوسیله دستگاه فلیم­فتومتر اندازه‌گیری شد. منحنی (Q/I) برای هر نمونه رسم گردید. نسبت فعالیت پتاسیم در حال تعادل (AR0k) بین(mmolL-1)0.5 872/0 تا 047/0، پتاسیم آسان قابل‌تبادل K0)Δ( بین (mmolkg-1) 269/1 تا 243/23، پتاسیم سخت قابل‌تبادل (KX) بین (mmolkg-1) 163/0 تا 328/16، پتاسیم قابل دسترس (KL) بین(mmolkg-1) 219/6 تا 593/38 می­باشد. بیش­ترین مقدار PBCK در خاک 11 (834/45) با درصد رس (38) و کم­ترین مقدار برای خاک 13 با مقدار (mmolkg-1)/(mmolL-1)0.5 329/23 و درصد رس (8) مشاهده گردید. بین ΔK0 و  (AR0k)همبستگی مثبت و معنی‌دار (01/0 p<،90/0=r) مشاهده گردید. PBCK با درصد رس (01/0 p<،74/0=r) و ظرفیت تبادل کاتیونی خاک (01/0 p<،73/0=r) همبستگی مثبت و معنی‌داری نشان داد. با استفاده از روش رگرسیون چند متغیره گام به گام مشخص شد از بین تمام خصوصیات خاک، تنها مقدار رس طبق مدل آماری (631/0Clay (R2=482/0+875/17 PBCK=می­تواند بعنوان ویژگی مناسب به­منظور برآورد ظرفیت بالقوه پتاسیم خاک استفاده شود. هم­چنین طبق مدل آماری ) 318/0(R2= O.C017/9+468/14KL= مقدار کربن آلی (O.C)، بعنوان خصوصیت مناسب برای برآورد مقدار KL تعیین گردید. 

جزئیات مقاله

کلمات کلیدی

پتاسیم, منحنی کمیت-شدت, PBCK, Δk

مراجع
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ارجاع به مقاله
موسی پورم., فرقانیا., & صبوریع. (2020). ارزیابی همبستگی ويژگي¬هاي خاک با پارامترهای منحنی Q/I پتاسیم در خاک¬های آهکی استان لرستان. آب و خاک, 34(2), 379-391. https://doi.org/10.22067/jsw.v34i2.79749
نوع مقاله
علمی - پژوهشی